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you can try :

    vector<vector<double>> x = { {1.7,2.8,3.9},{4,5.1,6.2} };
    Mat w(x[0]),a;
    for (int i = 1; i < x.size(); i++)
        w.push_back(Mat(x[i]));
    w = w.reshape(x[0].size());
    w.convertTo(a, CV_16U);
    cout << w << "\n";
    cout << a << "\n";

results :

[1.7, 2.8, 3.9;
 4, 5.1, 6.2]
[2, 3, 4;
 4, 5, 6]